US officials maintain that their terror watch lists are an important part of the country's effort to combat terrorism. But with no way for people to know if they're on a list, and no way to get themselves removed, critics say the lists are a threat to our civil rights.

US officials maintain that their terror watch lists are an important part of the country's effort to combat terrorism. But with no way for people to know if they're on a list, and no way to get themselves removed, critics say the lists are a threat to our civil rights.